بررسی تاثیر مقادیر مختلف کود نیتروژن بر خصوصیات کمی و مرفولوژیکی چهار رقم آفتابگردان

Abstract:
The effect of different nitrogen fertilizer was evaluated on quantitative and morphological trait of four sunflower
cultivars in Nehbandan city. The experiment was conducted in a split plot experiment in a randomized complete
block design with three replications. Main plots were included Allstar, Progress, Hysun 33 and Auroflor
cultivars and subplots were included Nitrogen values at three levels 0, 90 and 180 kg/hec. The results of this
study indicate that grain yield, total biomass, harvest index (HI), the ratio of head per plant to biomass and the
ratio of seed per head to biomass was higher in Progress cultivar. Therefore, its planting in the Nehbandan
would be useful. The results of this study confirmed that the morphological and quantitative traits, including
plant height, stem diameter, head diameter, the number of seeds per head, seed yield, head yield, biomass, the
number of seeds per plant, the ratio of seed per head to biomass, the ratio of seed per plant to biomass and
harvest index has been affected by nitrogen fertilizer. So that 180 kg/hec nitrogen in two vegetative stages was
the best ratio in the Nehbandan region.